// // class 关键字

// function Person (name){
//   this.name = name
// }

// Person.prototype.say = function(){
//   console.log(`hi, my name is ${this.name}`)
// }

class Person{
  constructor(name){
    this.name = name
  }

  say(){
    console.log(`hi, my name is ${this.name}`)
  }
}

const p = new Person('Tom')
p.say()